Hey Paul you will never be happy with any keyboard other than your precious Mini. I am telling you now that buying a Karma will not fulfill your needs. The Karma has a very steep learning curve or so I am led to believe from the reviews. I do not think that you will be satisfied with the sounds it will produce.

You tend to change the way your wind blows far too often, I would recommend you save and save until you eventually have enough for your Holy Grail Synth.
Just my two cent worth considering we have had [or read about] this discussion far too often in past threads..